Did I miss how to do the re-learn procedure and what it actually does?

 

Found out today this is very true. My 2017 L5P has had a engine light on for about 3 years. I have been resetting but now I have the permanent code stored for it & can't remote start. My bad plug was #7. I pulled 5 first & it was effortless. Number 7 was a different story. Could get one click on the ratchet one way & one the other. I put PB on it repeatedly, it would make a high pitch sound everytime it move. After 2 hours of back & forth a click at a time over & over I finally got all the threads out of the head but the glow plug was captured by all the carbon. I kept turning repeatedly while using my finger tips to pull outward. Finally got it out. I called my dealer to get the much needed reamer & instead of making me buy one they loaned me theirs! Outstanding customer relations. I put the new plugs in tomorrow once the holes are reamed.

 

. . . and what are your plans about the carbon that will be broken loose by the reamer?

 

You put a thin coating of grease on the reamer which is supposed to catch the carbon. Work a little at a time removing the tool, cleaning it off, and adding a little more grease.

 

Mike did you ever get some measurements off this?

 

Ceramic Glow Plug Replacement – TechLink

gm-techlink.com

Ceramic Glow Plug Replacement
May 31, 2024
Successfully replacing ceramic glow plugs (Fig. 1) in diesel engines requires carefully handling of the plugs and following the proper service procedures in order to prevent potential performance issues.

Fig. 1

Here are a few tips on ceramic glow plug replacement on the 1.6L I4 diesel engine (RPO LH7), Duramax 3.0L I6 diesel engine (RPO LM2, LZ0) and Duramax 6.6L V8 diesel engine (RPO L5P, L5D) available in 2017-2019 Cruze; 2017-2024 Silverado 2500/3500, Sierra 2500/3500; 2018-2019 Equinox, Terrain; 2019-2022 Silverado 4500/5500/6500; 2020-2024 Silverado 1500, Sierra 1500; and 2021-2024 Tahoe/Suburban and Yukon models.

• Measure the resistance of a new glow plug. An open circuit in a glow plug indicates that the glow-plug tip is broken and should not be installed in an engine.
• Do not install a glow plug into an engine if the glow plug has been dropped.
• Pull on the tip of a new glow plug before installation. Be sure your hands are clean before handling the glow plug.
• Always use the EN-52074 Glow Plug Bore Reamer (Fig. 2) when replacing a ceramic glow plug on the 1.6L, 3.0L and 6.6L diesel engines. A glow plug hole bore cleaning tool will remove the soot built up on the inside of the glow plug hole. Once a glow plug is removed, the soot collected in the bore must be removed. Otherwise, the soot could “side load” the new glow plug and induce a premature failure. The only exception to this is when servicing a glow plug on a 2.0L or 2.8L diesel engine.

Fig. 2

• Never use any type of grease or anti-seize compound on a new glow plug. Using any lubricant could lead to over-tightening of the glow plug.
• When installing a glow plug, make sure that it is in line with the glow-plug hole. Any side load placed on the glow plug could cause a crack in the ceramic, which would lead to premature failure.
• Do not use power tools to install a glow plug.
• Do not overtighten a glow plug. An overtightened glow plug could initiate a crack in the ceramic, leading to premature failure.

For more information, refer to Bulletin #23-NA-032.

 

Just a fallow up from my original post. The tool came in finally with the PN GM-52074 printed on it. I had been waiting since early Jan. I’m not sure if they have more of them ready to ship or not. I suggest buying one before your glow plugs give out, so your not forced with a decision to go at it without or wait for the tool.

I bought the tool from International for $122.40. + shipping and tax came to $142.64

FYI, I did not do any glow plug re-learn. Put the new one in and started it up, no check engine light, (No issues since I installed a few weeks ago, and its been cold!)

 

Hey guys!

New product came out recently...

Duramax Glow Plug Reamer Tool for All Model Years Including the L5P| 2001 - 2025

Made in the USA, the Duramax Glow Plug Reamer Tool is designed specifically for all 6.6L Duramax engines (2001–2025). Prevent glow plug cracking, clear soot buildup, and simplify replacements with this easy-to-use hand tool.

www.merchant-automotive.com

 

Good deal. Got one coming. Better than nearly 300 for the other one.

 

DmaxStore also just released theirs at $108 just an FYI.

 

In case LBZ folks are on this thread, it appears your tool is still priced much higher. The year 2016-25 one is the lower price.